show ip interface brief
1、如果交换机上没有做VLAN 可以直接使用：show arp
MPG3560#sh arp Protocol Address Age (min) Hardware Addr Type Interface Internet 10.16.254.21 228 1cdf.0fdd.1c04 ARPA GigabitEthernet0/9 Internet 10.16.254.22 - fcfb.fbc8.7ec9 ARPA GigabitEthernet0/9 Internet 10.96.166.1 - fcfb.fbc8.7ec5 ARPA GigabitEthernet0/5 Internet 10.96.166.2 0 0007.baac.52fb ARPA GigabitEthernet0/5
2、如果交换机上做了VLAN，接口是处于VLAN下，show arp 中显示的接口都是vlan的名字。这时需要通过 show arp 先查出mac地址(如查出一个MAC为 b897.5a96.931c )，然后使用 show mac-address-table | in b897.5a96.931c 就可以看到其所在的接口
hotline_3560#sh arp Protocol Address Age (min) Hardware Addr Type Interface Internet 192.168.96.112 5 c89c.dca3.e77c ARPA Vlan1 Internet 192.168.96.113 0 b897.5a96.931c ARPA Vlan1 <--查这个IP在哪个接口 Internet 192.168.96.117 33 0021.9b09.7849 ARPA Vlan1 hotline_3560#sh mac-address-table | in b897.5a96.931c 1 b897.5a96.931c DYNAMIC Fa0/13